Update 1.2 tests for N-Quads and TriG tests

[rubensworks]

While implementing and testing support for an 1.2 parser, I noticed that #135 did not update the N-Quads and TriG tests yet. These seem to be testing the old RDF-star syntax instead of the new reifier/triple terms syntax.

[gkellogg]

Yes, as Turtle and related syntax items were still being discussed, I didn’t want to put in a lot of work on the test suite that could become invalid. This is why it’s important to decide these things soon.

That said, I’d updates were made to the TriG and N-Quads suites, I wouldn’t object.